... may keep the doctor away. A recent Japanese study found that people who ate citrus fruit nearly every day had a lower risk of cardiovascular disease than those who almost never ate any. According to the study, the high antioxidant levels in citrus may block the formation of free radicals and repair existing damage. Try adding orange, tangerine or grapefruit sections in your salads. Another yummy way to add some citrus to your diet is to substitute diced citrus for tomatoes in salsa to use as a quick sauce for grilled fish.